Slideshow: Rotator Cuff

The Rotator Cuff

The Shoulder Girdle consists of 2 bones

The Scapula

The Shoulder Girdle consists of 2 bones

The Scapula

The Clavicle

The Shoulder Girdle consists of 2 bones

The Scapula

The Clavicle

The Shoulder Girdle consists of 2 bones

The rotator cuff muscles surround the proximal

humerus and move the arm in different directions

There are four rotator cuff muscles

Anterior View

Subscapularis

Anterior View

Subscapularis

Anterior View

Subscapularis

Arises from the anterior or ventral

surface of the scapula

Anterior View

SubscapularisArises from the anterior or

ventral surface of the scapula

Anterior View

Attaches onto the lesser tuberosity of

the humerus

SubscapularisArises from the anterior or

ventral surface of the scapula

Anterior View

Attaches onto the lesser tuberosity of the humerus

Internally rotates the arm

SubscapularisArises from the anterior or

ventral surface of the scapula

Anterior View

Attaches onto the lesser tuberosity of the humerus

Internally rotates the arm

Supplied by Upper and Lower

Subscapular Nerves

SubscapularisArises from the anterior or

ventral surface of the scapula

Anterior View

Attaches onto the lesser tuberosity of the humerus

Internally rotates the arm

Supplied by Upper and Lower Subscapular Nerves

SupraspinatusArises from the supraspinous

fossa on the posterior or dorsal aspect of the scapula

SupraspinatusArises from the supraspinous fossa on

the posterior or dorsal aspect of the scapula

Inserts onto the superior facet on the Greater

Tuberosity of the Humerus

SupraspinatusArises from the supraspinous fossa on

the posterior or dorsal aspect of the scapula

Inserts onto the superior facet on the greater tuberosity of the

humerus

Abducts the Arm

SupraspinatusArises from the supraspinous fossa on

the posterior or dorsal aspect of the scapula

Inserts onto the superior facet on the greater tuberosity of the

humerus

Abducts the Arm

Supplied by the Suprascapular

nerve

SupraspinatusArises from the supraspinous fossa on

the posterior or dorsal aspect of the scapula

Inserts onto the superior facet on the greater tuberosity of the

humerus

Abducts the Arm

Supplied by the Suprascapular nerve

Superior or bird’s eye view of shoulder joint

Right side

Superior or bird’s eye view of shoulder joint

Anterior

Right side

Superior or bird’s eye view of shoulder jointAnterior

PosteriorRight side

Superior or bird’s eye view of shoulder jointAnterior

Posterior

Right side

Superior or bird’s eye view of shoulder joint

Scapula

Anterior

Posterior

Right side

Superior or bird’s eye view of shoulder joint

HumerusScapula

Anterior

Posterior

Right side

Superior or bird’s eye view of shoulder joint

Scapula

Greater Tuberosity

Anterior

Posterior

Right side

Superior or bird’s eye view of shoulder joint

Greater Tuberosity

Coracoid

Anterior

Posterior

Right side

Superior or bird’s eye view of shoulder joint

Greater Tuberosity

Coracoid

Acromion

Anterior

Posterior

Right side

Superior or bird’s eye view of shoulder joint

Greater Tuberosity

Coracoid

Acromion

Anterior

Posterior

Supraspinous Fossa

Right side

Superior or bird’s eye view of shoulder joint

Greater Tuberosity

Coracoid

Acromion

Anterior

Posterior

SupraspinatusMuscle

Right side

Posterior View

Posterior View

Posterior View

Infraspinatus

Posterior View

Infraspinatus

Originates from the Infraspinous Fossa on

posterior or dorsal aspect of Scapula

Posterior View

InfraspinatusOriginates from the Infraspinous Fossa on

posterior or dorsal aspect of scapula

Inserts onto the middle facet on the greater tuberosity of

the humerus

Posterior View

InfraspinatusOriginates from the Infraspinous Fossa on

posterior or dorsal aspect of scapula

Inserts onto the middle facet on the greater tuberosity of the humerus

Externally rotates the arm

Posterior View

InfraspinatusOriginates from the Infraspinous Fossa on

posterior or dorsal aspect of scapula

Inserts onto the middle facet on the greater tuberosity of the humerus

Externally rotates the arm

Supplied by Suprascapular

Nerve

Posterior View

InfraspinatusOriginates from the Infraspinous Fossa on

posterior or dorsal aspect of scapula

Inserts onto the middle facet on the greater tuberosity of the humerus

Externally rotates the arm

Suprascapular Nerve

Posterior View

Posterior View

Posterior View

Teres Minor

Posterior View

Teres Minor

Originates from the superior part of lateral border of

scapula

Posterior View

Teres MinorOriginates from the superior part of lateral

border of scapula

Inserts onto the inferior facet on

greater tuberosity of humerus

Posterior View

Teres MinorOriginates from the superior part of lateral

border of scapula

Inserts onto the inferior facet on greater tuberosity of humerus

Externally rotates the arm

Posterior View

Teres MinorOriginates from the superior part of lateral

border of scapula

Inserts onto the inferior facet on greater tuberosity of humerus

Externally rotates the arm

Supplied by Axillary nerve

Posterior View

Teres MinorOriginates from the superior part of lateral

border of scapula

Inserts onto the inferior facet on greater tuberosity of humerus

Externally rotates the arm

Axillary nerve

Summary of muscles

SubscapularisOrigin Subscapular fossa of scapulaInsertion Lesser tuberosity of humerus

Action Internal rotation and adduction of the arm

Nerve Supply Upper and lower subscapular nerves (C5, C6 and C7)

Blood Supply Subscapular artery

Anterior Chest Wall

Posterior Chest Wall

SupraspinatusOrigin Supraspinous fossa of scapula

Insertion Superior facet on greater tuberosity of humerus

Action Abduction of armNerve Supply Suprascapular nerve (C4, C5

and C6)Blood Supply Suprascapular artery

Posterior Chest Wall

InfraspinatusOrigin Infraspinous fossa of scapulaInsertion Middle facet on greater

tuberosity of humerusAction Externally rotates armNerve Supply Suprascapular nerve (C5 and

C6)Blood Supply Suprascapular and circumflex

scapular arteries